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Components of Lease Expense (Details)
$ in Millions
3 Months Ended
Mar. 31, 2019
USD ($)
Finance lease cost:  
Amortization of finance lease assets $ 0.4
Interest on lease liabilities 0.3
Total finance lease cost 0.7
Operating lease cost 17.4
Short-term lease cost 4.3
Variable lease cost 5.9
Total lease cost $ 28.3